qos 3560

Bogdan shoshon at shoshon.ro
Thu Nov 12 08:04:07 CST 2009


hello

indeed, a fellow nanoger gave me this hint.

1. i had to enable mls qos globally in "network" switches
2. set the mls qos trust dscp on the uplinks (ingress port)


thanks

ps thanks to andrey.gordon too :)





On 11/12/2009 03:21 PM, Brian Feeny wrote:
>
> You should make sure that any links that go between devices have trust
> set.  In your case if your doing DSCP,
> then make sure each link that goes between devices which must carry
> tagged packets have trust dscp set.
>
> Brian
>
> On Nov 12, 2009, at 5:11 AM, Bogdan wrote:
>
>> hello
>>
>> i am playing with qos on some devices
>> - cisco 3560
>> - cisco 7609
>> and i have some things that i don't seem to understand.
>>
>> 1. in 3560, i enable mls qos, on the ingress port applyed policy map,
>> classify the packets with acl, mark, all good. on the egress ports i use
>> srr-queue with shape/share, everything is fine, it is working.
>>
>> http://www.cisco.com/en/US/docs/switches/lan/catalyst3560/software/release/12.2_20_se/configuration/guide/swqos.html#wp1028614
>>
>>
>>
>> 2. reset to defaults the 3560
>> in 7606 i pick up a vlan, and apply a policy-map and set dscp 40 on
>> egress of that vlan
>> 3560 in uplinked in 7609
>> in 3560 i can see the "marked" packets, and i have matches on the dscp
>> set earlier (sh mls qos int xx stat).
>> the problem is: when i apply the srr-queue in 3560 on egress (towards
>> the test port), it does not work.
>> if i enable mls qos on 3560, i cannot match anymore the dscp 40 from the
>> 7609
>>
>> is it normal? do i have to apply the qos stuff (point1) on all switches
>> i want qos on? i mean, i cannot set dscp in one "core" device and use
>> that in the whole network ?
>>
>>
>> thanks
>>
>>
>
>






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